So code p0031 came up on my 08 street glide,and shows code to bad 02 sensor,but i have after market exhaust with plugs in my 02 sensor holes so i replaced the elimanator plugs and reset my code and rode for a minute and code poped back up..any help please im stumped

 

How is it running? If it runs fine I wouldn't worry about it too much. If it's running badly it can be other things beside the actual 02 sensor. The computer might be telling you that there is a lean condition. Yesterday my brothers Sportster had the same code and was running badly. A new fuel filter fixed it.

 

Are you sure that's the only code? Check your charging system. Hopefully not the problem but I've had O2 sensor codes come up when I've had voltage regulator issues on my 08.